QUERY PLAN
GroupAggregate (cost=52.68..52.73 rows=3 width=12)
Group Key: parent_id
-> Sort (cost=52.68..52.69 rows=3 width=4)
Sort Key: parent_id
-> Seq Scan on tbl_tasks (cost=0.00..52.65 rows=3 width=4)
Filter: ((status = 1) AND (parent_id = ANY ('{1709,1708,1620}'::integer[])))